linux-kernel - [PATCH v2 00/13] Add static

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Date:   Mon, 07 Oct 2019 10:27:08 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org
Cc:     peterz@...radead.org, linux-kernel@...r.kernel.org,
        rostedt@...dmis.org, mhiramat@...nel.org, bristot@...hat.com,
        jbaron@...mai.com, torvalds@...ux-foundation.org,
        tglx@...utronix.de, mingo@...nel.org, namit@...are.com,
        hpa@...or.com, luto@...nel.org, ard.biesheuvel@...aro.org,
        jpoimboe@...hat.com
Subject: [PATCH v2 00/13] Add static_call()

This series, which depends on the previous two, introduces static_call().

static_call(), is the idea of static_branch() applied to indirect function
calls. Remove a data load (indirection) by modifying the text.

These patches are still based on the work Josh did earlier, but incorporated
feedback from the last posting and have a lot of extra patches which resulted
from me trying to actually use static_call().

This still relies on objtool to generate the .static_call_sites section, mostly
because this is a natural place for x86_64 and works for both GCC and LLVM.
Other architectures can pick other means if/when they implement the inline
patching. The out-of-line (aka. trampoline) variant doesn't require this.